Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4247450cc14daaf…

MALICIOUS

PDF

65.4 KB Created: 2021-06-09 01:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: eaf3dc60ad4e2ec1a9c55308a92d6abc SHA-1: 212fcd7d39be0e309868798a5b413aa82b292436 SHA-256: a4247450cc14daafab4c8a04997bfb24bf873c4ef24d489642e0764c29be3820
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://irlanc.ru/uplcv?utm_term=swift+analysis+aptitude+test+answers PDF link annotation
    • https://atlastoursntravels.com/userfiles/file/96577821616.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/627070732032e48620f4ddcdcd9fc1b9/jategowuwazimutepa.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/nuxajatozajutowakudanik.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/sugitupevarewirumibafo.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/774535278.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a986260b7---82525264357.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd9b373734---puzugasujixibunigowukomib.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/ukrliq0v77fsqjld4fb3jqki6a/88915579939.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/0cc7oaeoagrlsdkkvltf4m8kac/mamurazajivufupalub.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a60b704f3ca---70464196095.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/6rbtj7e3ke25tr1pb5g7rlquv4/90715646840.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160771d278fe92---18632300065.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/68800279932.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2a4f053a3---tefoz.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed987de54d---notuvikitatukosajiriwij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53E 5332 bytes
SHA-256: 1f6ae286695883325e94160170a42a7d2287def092b9428cfd1299b5dd3791a4
font_01_sfnt_off0000d785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD785 9772 bytes
SHA-256: 3b40577413570b7853deb166561c509fd21fbbf9710d0f7bba816784c16f9fe6